CN106944467A - A kind of combined type multiphase extraction system and its method for extracting - Google Patents
A kind of combined type multiphase extraction system and its method for extracting Download PDFInfo
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- CN106944467A CN106944467A CN201710304934.8A CN201710304934A CN106944467A CN 106944467 A CN106944467 A CN 106944467A CN 201710304934 A CN201710304934 A CN 201710304934A CN 106944467 A CN106944467 A CN 106944467A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention discloses a kind of combined type multiphase extraction system and its method for extracting, for contaminated site soil and groundwater remediation, the extraction system includes underground combined type multiphase extracting gang of wells and ground extraction device；Short screen casing multiphase extraction well and long screen casing multiphase extraction well that underground combined type multiphase extracting gang of wells is set comprising some combinations.Short screen casing multiphase extraction well includes well casing and the short screen casing for being arranged on well casing bottom.Long screen casing multiphase extraction well includes well casing and the long screen casing for being arranged on well casing bottom.Long screen casing multiphase extraction well and short screen casing multiphase extraction well are connected to vavuum pump by the long screen casing ground extraction device and short screen casing ground extraction device that are made up of flexible pipe and branch pipe respectively.Present invention also offers the method for extracting of the combined type multiphase extraction system.Combined type multiphase extraction system and its method for extracting that the present invention is provided, can carry out intense adjustment, so as to realize highly efficient multiphase extraction effect for the local difference existed in contaminated site.
Description
Technical field
The present invention relates to a kind of contaminated sites repair system and method, in particular it relates to which a kind of be used for contaminated site soil
The combined type multiphase extraction system and its method for extracting based on Application of light well point precipitation technique of groundwater remediation engineering.
Background technology
Application of light well point precipitation technology is a kind of conventional artificial reduction underground in earth work, ground and basic engineering construction
The method of water level.The purpose is to by the moisture in drainage base soil, promote soil solidifying, foundation strength and stability of slope are improved
Property, it is that good execution conditions are created in next step foundation construction.Application of light well point precipitation device mainly includes well-point pipe, water suction house steward
And extractor.The device is by burying the water suction well-point pipes of some certain depths in construction project to be built foundation ditch region, in ground peace
Dress water suction house steward and extractor, underground water is constantly aspirated by extractor from well-point pipe, makes underground water in foundation ditch gradually
It is reduced to certain depth.Application of light well point precipitation device has the advantage that equipment is simple, easily operated, be easy to management.
Multiphase extraction technique is a kind of original position soil groundwater remediation technology, by applying to the extraction well installed in underground
Vacuum, while by the soil gas in underground aeration zone and saturated zone, polluted underground water and water-insoluble free phase (if deposited
) extract to ground, next step disposal is discharged or done after then being handled through ground processing facility.Its applicable target stains
Species type includes volatile organic contaminant, biodegradable half volatile organic contaminant and recyclable water-insoluble stream
Body etc., using wide.
At present, domestic existing practical studies are combined Application of light well point precipitation technology for contaminated site with multiphase extraction technique
Repairing and treating, such as Authorization Notice No. are the U of CN 205035816, entitled a kind of based on the simple many of Application of light well point precipitation technique
The utility model patent of phase extraction device is enclosed within improved simple multiphase extracting on Application of light well point precipitation Process ba- sis there is provided one
Device, its equipment and operation expense can be substantially reduced, and simple to operate, technology maturation.However, should in recovery project
With in practice, because extraction well screen casing length sets the single of type, such multiphase extraction system often has some aspects
Deficiency, can not such as reach can cause more serious polluted underground water in water-bearing layer in expected underground water drawdown, extractive process
Mix up and down, or expected soil gas extraction effect etc. can not be reached.
For short screen casing multiphase extraction well, screen casing is located at water-bearing layer in well casing bottom, extractive process and not connected substantially with air
Logical, extractive process is mainly to extract based on underground water, with preferable dewatering effect；But it is due to that screen casing position is relatively low, extracting
Direction of groundwater flow from top to bottom occurs in water-bearing layer during operation, may cause pollutant from water-bearing layer upper strata heavily contaminated region to
The transfer of the light Polluted area of lower floor；In addition, short screen casing multiphase extraction well is not good enough to the extraction effect of soil gas.
For long screen casing multiphase extraction well, screen casing length is matched with pollution depth, multiphase extracting path directly, resistance compared with
Small, extracting initial operating stage energy Rapid extraction goes out the polluted underground water on water-bearing layer upper strata, is then forming certain underground water drawdown
Afterwards to extract based on soil gas；However as the reduction of level of ground water, the extracting later stage occurs that extracting negative pressure passes through extraction well
Screen casing, level of ground water decline after formed unsaturation band soil and air formed it is preferable connect situation, so as to reduce underground water
The efficiency of extracting, declines level of ground water and does not reach expected design, and dirt can not be completely covered in the influence depth of soil gas extracting
Contaminate depth.
Therefore, it is necessary on the basis of the existing multiphase extraction device based on Application of light well point precipitation technique, be taken out to multiphase
The system of carrying is further improved, by more flexible application form, multiphase extraction system is can adapt to different pollutions
The place of feature and different hydrogeologic conditions, and intense adjustment can be carried out for the local difference existed in contaminated site, from
And realize highly efficient multiphase extraction effect.
The content of the invention
It is an object of the invention to provide a kind of system and method for contaminated site soil and groundwater remediation engineering, have
More flexible application form, the multiphase extraction device based on Application of light well point precipitation technique not enough present on operative practice,
Multiphase extraction system is set to can adapt to the place of different contamination characteristics and different hydrogeologic conditions, and can be in contaminated site
The local difference of presence carries out intense adjustment, so as to realize highly efficient multiphase extraction effect.
In order to achieve the above object, the invention provides a kind of combined type multiphase extraction system, for contaminated site soil
Groundwater remediation, wherein, the extraction system includes underground combined type multiphase extracting gang of wells and ground extraction device；Described ground
Short screen casing multiphase extraction well and long screen casing multiphase extraction well that lower combined type multiphase extracting gang of wells is set comprising some combinations；It is described
Ground extraction device correspondingly include separate short screen casing ground extraction device and long screen casing ground extraction device.
Combinations of the above formula multiphase extraction system, wherein, described extraction system, its short screen casing multiphase extraction well includes well
The short screen casing of well casing bottom is managed and is arranged on, described short screen casing length is 1~1.5m.It is mainly used in extracting out under pollution water-bearing layer
The underground water of layer, forms effective underground water drawdown in restoring area, is that the extracting of soil gas creates conditions.
Combinations of the above formula multiphase extraction system, wherein, described extraction system, its long screen casing multiphase extraction well includes well
The long screen casing of well casing bottom is managed and is arranged on, described long screen casing length is more than the reparation depth of whole underground water.It is mainly used in
The quick underground water for extracting pollution water-bearing layer upper strata out, and it is mainly used in taking out for soil gas after the effective drawdown of underground water is formed
Carry.
Combinations of the above formula multiphase extraction system, wherein, the well casing and short screen casing multiphase of the long screen casing multiphase extraction well
Sand filter blanket is filled by bottom up in the well casing of extraction well, packed height matches with screen casing length, and packed height compares institute
The high 0.5m of screen casing length in well casing, i.e. sand filter blanket should typically be filled to more than screen casing about 0.5m.Preferably, sand filter blanket is arranged on
Outside screen casing and within well casing, i.e., between screen casing and well casing.
Combinations of the above formula multiphase extraction system, wherein, the well casing and short screen casing multiphase of the long screen casing multiphase extraction well
In the well casing of extraction well, on the sand filter blanket of filling and well head has sealing layer, described sealing layer is to use swelling
Grave mouthful compacting；Sentence cement mortar sealing of hole in ground on sealing layer；Bentonite is used below well head after sieve tube segment back-up sand in well
Sealing compacting, ground uses cement mortar sealing of hole, and hole sealing depth is rationally determined according to actual level of ground water.
Combinations of the above formula multiphase extraction system, wherein, the long screen casing multiphase extraction well and short screen casing multiphase extraction well,
Connected respectively by the separate long screen casing ground extraction device being made up of flexible pipe and branch pipe and short screen casing ground extraction device
It is connected to separate vavuum pump.I.e. short screen casing multiphase extraction well and long screen casing multiphase extraction well, each via flexible pipe and branch pipe
System is connected to separate vavuum pump, forms separate ground extraction device.
Combinations of the above formula multiphase extraction system, wherein, the long screen casing multiphase extraction well and short screen casing multiphase extraction well,
Alternate and equably set in the range of needing to repair；I.e. according to repair coverage and the extracting radius of influence, according to uniform
The principle laid and alternateed, is laid in the range of reparation；Long screen casing multiphase extraction well and the extracting of short screen casing multiphase
The density of setting of well is determined according to contaminated sites feature and hydrogeologic condition.
Combinations of the above formula multiphase extraction system, wherein, the long screen casing multiphase extraction well and short screen casing multiphase extraction well
Density of setting, different according to contaminated sites feature and hydrogeologic condition, described density of setting is complete for contaminated site
Field density of setting or local density of setting.That is, according to different contaminated sites features or the difference of hydrogeologic condition,
Uniformly lay and alternate on the basis of principle, can flexibly increase short screen casing multiphase extraction well in the whole audience or long screen casing multiphase is taken out
Carry the layout density of well；Can also be according to the local difference of the contaminated sites feature or hydrogeologic condition that exist in place, equal
Even laying and on the basis of alternateing principle, can flexibly increase the short screen casing multiphase extraction well of regional area or long screen casing multiphase is taken out
Carry the layout density of well.
Present invention also offers the method for extracting of combinations of the above formula multiphase extraction system, wherein, this method is included：Step
1, according to the geology and hydrogeology condition in place, with reference to associated restoration engineering experience, consider the live feelings of restoring area
Condition, determines the radius of influence of multiphase extraction well；Step 2, the multiphase determined according to contaminated site repair coverage and step 1 is extracted
The radius of influence of well, carries out the laying of multiphase extracting well point position, wherein short screen casing multiphase extraction well and long screen casing multiphase extraction well
Alternate and equably laid；Specifically, principle is laid according to uniform, is uniformly laid respectively in the range of reparation short
Screen casing multiphase extraction well and long screen casing multiphase extraction well, according to laying principle is alternateed, short screen casing multiphase extraction well and length are sieved
The position of pipe multiphase extraction well is mutually located at the center of respective gap area；Step 3, according to restoring area pollution depth, carry out
The mounting design of multiphase extraction well；Step 4, according to the point arrangement and mounting design of multiphase extraction well, short screen casing multiphase is carried out
The installation of extraction well and long screen casing multiphase extraction well；Step 5, mounted short screen casing multiphase extraction well and long screen casing multiphase are taken out
Carry well and separate vavuum pump is connected to by flexible pipe and manifold system respectively, form separate short screen casing ground extracting
Device and long screen casing ground extraction device；Step 6, contaminated site soil is carried out by mounted combined type multiphase extraction system
Groundwater extraction；Step 7, the air-water mixture short screen casing multiphase extraction well and long screen casing multiphase extraction well extracted out passes through ground
Processing unit is handled；Described floor-treating device includes moisture trap share or single.That is, not
Underground water and soil in the air-water mixture that same operation phase, short screen casing multiphase extraction well and long screen casing multiphase extraction well are extracted out
The ratio of gas can be different, can subsequently converge to common moisture trap and be handled, can also be set different
Moisture trap is respectively processed.
The application method of combinations of the above formula multiphase extraction system, wherein, the mounting design described in step 3 is included：Multiphase
The fitting depth of extraction well matches with pollution depth, and the short screen section of short screen casing multiphase extraction well is located at well casing bottom, short
1~1.5m of screen casing length, the long screen casing of long screen casing multiphase extraction well is located at well casing bottom, and long screen casing length is more than whole underground water
Reparation depth, filling sand filter blanket in well casing, its height matches with the screen casing length in the well casing of place, should typically be filled to screen casing
About 0.5m above；Sealed and be compacted with bentonite in well after sieve tube segment back-up sand, below well head, ground uses cement mortar sealing of hole, sealing of hole
Depth is rationally determined according to actual level of ground water.
The combined type multiphase extraction system and its method for extracting that the present invention is provided have advantages below：
(1) short screen casing multiphase extraction well is passed through, it is ensured that the formation of design underground water drawdown, it is ensured that the aqueous phase of underground water is taken out
Carry and producing a desired effect；
(2) by long screen casing multiphase extraction well, the quick polluted underground water for extracting water-bearing layer upper strata out can be in very short time
It is interior to form the drawdown of a relative efficiency, while the extracting of whole restoring area soil gas can be strengthened, improve remediation efficiency；
(3), can be many by the way that short screen casing is adjusted flexibly for different contamination characteristics and the place of different hydrogeologic conditions
The extraction effect of the laying ratio of phase extraction well and long screen casing multiphase extraction well, reinforcing underground water or soil gas；
(4) there is the reparation place of substantially local difference for pollution level or site condition, can flexibly increase emphasis area
The layout density of the short screen casing multiphase extraction well in domain or long screen casing multiphase extraction well, strengthens the multiphase extraction effect of key area.
Therefore, the present invention compensate for single multiphase extraction system and existed not by the modular design of long and short screen casing
Foot, with stronger practical application flexibility, can realize highly efficient multiphase extraction effect.
Brief description of the drawings
Fig. 1 is the structural representation of the combined type multiphase extraction system of the present invention.
Fig. 2 uniformly lays exemplary plot for the well point of the combined type multiphase extraction system of the present invention.
Fig. 3 lays exemplary plot for the well point reinforcing of the combined type multiphase extraction system of the present invention.
Fig. 4 lays exemplary plot for the well point emphasis of the combined type multiphase extraction system of the present invention.
Embodiment
The embodiment of the present invention is further described below in conjunction with accompanying drawing.
As shown in figure 1, the combined type multiphase extraction system that the present invention is provided, for contaminated site soil and groundwater remediation,
The system is included：Underground combined type multiphase extracting gang of wells and ground extraction device.
Short screen casing multiphase extraction well 1 and long screen casing multiphase that underground combined type multiphase extracting gang of wells is set comprising some combinations
Extraction well 2.Ground extraction device is correspondingly comprising separate short screen casing ground extraction device and long screen casing ground extracting dress
Put.
Short screen casing multiphase extraction well 1 is comprising well casing and is arranged on the short screen casing 3 of well casing bottom, and the short length of screen casing 3 is 1~
1.5m.It is mainly used in extracting out the underground water of pollution water-bearing layer lower floor, forms effective underground water drawdown in restoring area, be soil
The extracting of gas creates conditions.Long screen casing multiphase extraction well 2 includes well casing and the long screen casing 4 for being arranged on well casing bottom, long screen casing 4
Length is more than the reparation depth of whole underground water.It is mainly used in the quick underground water for extracting pollution water-bearing layer upper strata out, and is being formed
It is mainly used in the extracting of soil gas after the effective drawdown of underground water.The well casing and short screen casing multiphase of long screen casing multiphase extraction well 2 are taken out
Carry in the well casing of well 1 and fill sand filter blanket 5 by bottom up, packed height matches with screen casing length, and packed height compares institute
The high 0.5m of screen casing length in well casing, i.e. sand filter blanket 5 should typically be filled to more than screen casing about 0.5m.Preferably, sand filter blanket 5 is set
Outside screen casing and within well casing, i.e., between screen casing and well casing.The well casing and short screen casing multiphase of long screen casing multiphase extraction well 2
In the well casing of extraction well 1, with the sealing layer that has of well head on the sand filter blanket 5 of filling, sealing layer is to use the envelope of bentonite 6
Mouth compacting；Sentence the sealing of hole of cement mortar 7 in ground on sealing layer；I.e. in well after sieve tube segment back-up sand, the envelope of bentonite 6 is used below well head
Mouth compacting, ground uses the sealing of hole of cement mortar 7, and hole sealing depth is rationally determined according to actual level of ground water.
Long screen casing multiphase extraction well 2 and short screen casing multiphase extraction well 1 are respectively by separate by flexible pipe 8 and branch pipe group
Into long screen casing ground extraction device and short screen casing ground extraction device be connected to separate vavuum pump.I.e. short screen casing multiphase
Extraction well 1 and long screen casing multiphase extraction well 2, separate vavuum pump is connected to each via flexible pipe 8 and manifold system, is formed
Separate ground extraction device.
Long screen casing multiphase extraction well 2 and short screen casing multiphase extraction well 1 are alternateed and uniformly in the range of needing to repair
Ground is set；I.e. according to repair coverage and the extracting radius of influence, according to the principle uniformly laid and alternateed, in repair coverage
It is interior to be laid；The density of setting of long screen casing multiphase extraction well 2 and short screen casing multiphase extraction well 1 according to contaminated sites feature and
Hydrogeologic condition is determined.The density of setting of long screen casing multiphase extraction well 2 and short screen casing multiphase extraction well 1, according to contaminated sites
Feature and hydrogeologic condition are different and different, and the density of setting is that contaminated site whole audience density of setting or local setting are close
Degree.That is, according to different contaminated sites features or the difference of hydrogeologic condition, uniformly laying and alternateing principle
On the basis of, it can flexibly increase the layout density of the short screen casing multiphase extraction well 2 of screen casing multiphase extraction well 1 or long in the whole audience；May be used also
According to the local difference of the contaminated sites feature or hydrogeologic condition that exist in place, uniformly to lay and alternate principle
On the basis of, it can flexibly increase the layout density of the short screen casing multiphase extraction well 1 of regional area or long screen casing multiphase extraction well 2.
Present invention also offers the method for extracting of combinations of the above formula multiphase extraction system, it is included：
Step 1, the radius of influence of multiphase extraction well is determined.
Step 2, the radius of influence of the multiphase extraction well determined according to contaminated site repair coverage and step 1, is carried out many
The mutually laying of extracting well point position, wherein short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 are alternateed and equably entered
Row is laid.
Step 3, according to restoring area pollution depth, the mounting design of multiphase extraction well is carried out.
Step 4, according to the point arrangement and mounting design of multiphase extraction well, short screen casing multiphase extraction well 1 and long sieve are carried out
The installation of pipe multiphase extraction well 2.
Step 5, mounted short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 are passed through into flexible pipe 8 and branch respectively
Guard system is connected to separate vavuum pump, forms separate short screen casing ground extraction device and long screen casing ground is extracted
Device.
Step 6, contaminated site soil groundwater extraction is carried out by mounted combined type multiphase extraction system.
Step 7, the air-water mixture short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 extracted out passes through ground
Processing unit 13 is handled；Floor-treating device 13 includes moisture trap share or single.
The combined type multiphase extraction system and its method for extracting provided with reference to embodiment the present invention is done further
Description.
Embodiment 1
A kind of combined type multiphase extraction system, comprising short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2, is installed
Depth is matched with pollution depth.The short screen casing 3 of short screen casing multiphase extraction well 1 is located at well casing bottom, and the length 1 of short screen casing 3~
1.5m, the length of long screen casing 4 of long screen casing multiphase extraction well 2 then covers whole groundwater remediation depth.Multiphase extraction well sand filter blanket 5
Packed height matched with the screen casing length in the well casing of place, be filled to more than screen casing about 0.5m.After the back-up sand of well point, well head with
The lower sealing of use bentonite 6 compacting, ground uses the sealing of hole of cement mortar 7.Mounted short screen casing multiphase extraction well 1 and long screen casing multiphase
Extraction well 2 extracts branch pipe 9 each via wired hose 8 and short screen casing and long screen casing extracting branch pipe 10 is connected to short screen casing and extracted very
Empty pump 11 and long screen casing extract vavuum pump 12, form separate ground extraction device.The air water of ground extraction device discharge
Mixture, gas-water separation and further processing are carried out by follow-up floor-treating device 13.
The present embodiment additionally provides the method for extracting of combinations of the above formula multiphase extraction system, and this method is included：
Step 1, according to the geology and hydrogeology condition in place, with reference to associated restoration engineering experience, reparation is considered
The field condition in region, determines the radius of influence of multiphase extraction well.
Step 2, the radius of influence of the multiphase extraction well determined according to contaminated site repair coverage and step 1, is carried out many
The mutually laying of extracting well point position, wherein short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 are alternateed and equably entered
Row is laid；Specifically, principle is laid according to uniform, uniformly lays the short He of screen casing multiphase extraction well 1 respectively in the range of reparation
Long screen casing multiphase extraction well 2, according to alternateing laying principle, short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2
Position is mutually located at the center of respective gap area.
Step 3, according to restoring area pollution depth, the mounting design of multiphase extraction well is carried out.Specifically, multiphase is extracted
The fitting depth of well matches with pollution depth, and the part of short screen casing 3 of short screen casing multiphase extraction well 1 is located at well casing bottom, short sieve
1~the 1.5m of length of pipe 3, the long screen casing 4 of long screen casing multiphase extraction well 2 is located at well casing bottom, under the long length of screen casing 4 is more than entirely
Filling sand filter blanket 5 in the reparation depth of water, well casing, its height is matched with the screen casing length in the well casing of place, should be typically filled to
More than screen casing about 0.5m；In well after sieve tube segment back-up sand, compacting is sealed with bentonite 6 below well head, ground uses the envelope of cement mortar 7
Hole, hole sealing depth is rationally determined according to actual level of ground water.
Step 4, according to the point arrangement and mounting design of multiphase extraction well, short screen casing multiphase extraction well 1 and long sieve are carried out
The installation of pipe multiphase extraction well 2.
Step 5, mounted short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 are passed through into flexible pipe 8 and branch respectively
Guard system is connected to separate vavuum pump, forms separate short screen casing ground extraction device and long screen casing ground is extracted
Device.
Step 6, contaminated site soil groundwater extraction is carried out by mounted combined type multiphase extraction system.
Step 7, the air-water mixture short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 extracted out passes through ground
Processing unit 13 is handled；Floor-treating device 13 includes moisture trap share or single.That is, in difference
Operation phase, underground water and soil in the air-water mixture that short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 are extracted out
The ratio of gas can be different, can subsequently converge to common moisture trap and be handled, can also be set different
Moisture trap is respectively processed.
The common several typical well location arrangement forms of combined type multiphase extraction system are as shown in figs. 2 to 4：
1 uniform laying：Principle is laid according to uniform, short screen casing multiphase extraction well 1 and the extracting of long screen casing multiphase is uniformly laid
Well 2, two kinds of screen casings are alternately arranged；
2 reinforcings are laid：The layout density and cloth of short screen casing multiphase extraction well 1 and long screen casing multiphase extraction well 2 is adjusted flexibly
If ratio, the extraction effect of reinforcing underground water or soil gas；
3 emphasis are laid：Flexibly the layout density of the local short screen casing in heavily contaminated region of increase or long screen casing, strengthens key area
Multiphase extraction effect.
Combined type multiphase extraction system and its method for extracting that the present invention is provided, can be applied to volatile organic matter, can give birth to
The soil and groundwater remediation work of the contaminated sites such as the semi-volatile organic matter and removable dynamic lightweight non-aqueous phase liquids of thing degraded
Journey, with technology maturation it is reliable, install and debugging cycle is short, run it is simple to operate flexibly, the advantage such as operation and maintenance cost is cheap.
The system sets the improvement combined with well casing horizontal layout by extracting the well casing screen casing length of gang of wells to underground multiphase, carries significantly
The high repairing effect of multiphase extraction system so that the multiphase extraction system is with can adapt to different contamination characteristics and the different hydrology
The contaminated site of matter condition, and intense adjustment can be carried out for the local difference existed in contaminated site, so as to realize flexible height
The multiphase extracting repairing effect of effect.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of combined type multiphase extraction system, for contaminated site soil and groundwater remediation, it is characterised in that the extracting system
System includes underground combined type multiphase extracting gang of wells and ground extraction device；If described underground combined type multiphase extracting gang of wells is included
Short screen casing multiphase extraction well and long screen casing multiphase extraction well that dry combination is set；Described ground extraction device correspondingly includes phase
Mutual independent short screen casing ground extraction device and long screen casing ground extraction device.
2. combined type multiphase extraction system according to claim 1, it is characterised in that described extraction system, its short sieve
Pipe multiphase extraction well includes well casing and the short screen casing for being arranged on well casing bottom, and described short screen casing length is 1~1.5m.
3. combined type multiphase extraction system according to claim 2, it is characterised in that described extraction system, it grows sieve
Pipe multiphase extraction well includes well casing and the long screen casing for being arranged on well casing bottom, and described long screen casing length is more than whole underground water
Repair depth.
4. combined type multiphase extraction system according to claim 3, it is characterised in that the long screen casing multiphase extraction well
Fill sand filter blanket by bottom up in the well casing of well casing and short screen casing multiphase extraction well, packed height with screen casing length phase
Match somebody with somebody, packed height is than the high 0.5m of screen casing length in the well casing of place.
5. combined type multiphase extraction system according to claim 4, it is characterised in that the long screen casing multiphase extraction well
It is described with the sealing layer that has of well head on the sand filter blanket of filling in the well casing of well casing and short screen casing multiphase extraction well
Sealing layer is to seal compacting using bentonite；Sentence cement mortar sealing of hole in ground on sealing layer.
6. combined type multiphase extraction system according to claim 5, it is characterised in that the long screen casing multiphase extraction well and
Short screen casing multiphase extraction well, passes through the separate long screen casing ground extraction device and short sieve being made up of flexible pipe and branch pipe respectively
Pipe ground extraction device is connected to separate vavuum pump.
7. combined type multiphase extraction system according to claim 6, it is characterised in that the long screen casing multiphase extraction well and
Short screen casing multiphase extraction well, alternates in the range of needing to repair and equably sets；Long screen casing multiphase extraction well and short
The density of setting of screen casing multiphase extraction well is determined according to contaminated sites feature and hydrogeologic condition.
8. combined type multiphase extraction system according to claim 7, it is characterised in that the long screen casing multiphase extraction well and
The density of setting of short screen casing multiphase extraction well, different, the described setting according to contaminated sites feature and hydrogeologic condition
Density is contaminated site whole audience density of setting or local density of setting.
9. a kind of method for extracting of combined type multiphase extraction system according to any one in claim 1~8, its feature
It is that this method is included：
Step 1, the radius of influence of multiphase extraction well is determined；
Step 2, the radius of influence of the multiphase extraction well determined according to contaminated site repair coverage and step 1, carries out multiphase and takes out
The laying of well point position is proposed, wherein short screen casing multiphase extraction well and long screen casing multiphase extraction well alternate and equably carry out cloth
If；Uniformly lay short screen casing multiphase extraction well and long screen casing multiphase extraction well, short screen casing multiphase extracting respectively in the range of reparation
The position of well and long screen casing multiphase extraction well is mutually located at the center of respective gap area；
Step 3, according to restoring area pollution depth, the mounting design of multiphase extraction well is carried out；
Step 4, according to the point arrangement and mounting design of multiphase extraction well, short screen casing multiphase extraction well and long screen casing multiphase are carried out
The installation of extraction well；
Step 5, mounted short screen casing multiphase extraction well and long screen casing multiphase extraction well are connected by flexible pipe with branch pipe respectively
To separate vavuum pump, separate short screen casing ground extraction device and long screen casing ground extraction device is formed；
Step 6, contaminated site soil groundwater extraction is carried out by mounted combined type multiphase extraction system；
Step 7, the air-water mixture short screen casing multiphase extraction well and long screen casing multiphase extraction well extracted out is filled by floor treatment
Put and handled；Described floor-treating device includes moisture trap share or single.
10. the method for extracting of combined type multiphase extraction system according to claim 9, it is characterised in that described in step 3
Mounting design is included：The fitting depth of multiphase extraction well matches with pollution depth, the short phloem of short screen casing multiphase extraction well
Divide and be located at well casing bottom, 1~1.5m of short screen casing length, the screen casing of long screen casing multiphase extraction well is located at well casing bottom, and long screen casing is long
Degree is more than the reparation depth of whole underground water, filling sand filter blanket in well casing, its height with the screen casing length in the well casing of place
Match somebody with somebody, be filled to short screen casing or long screen casing above 0.5m；Sealed and be compacted with bentonite in well after sieve tube segment back-up sand, below well head, ground
Using cement mortar sealing of hole, hole sealing depth is determined according to actual level of ground water.
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